Question

Match List I with List II

List I	List II
(A). Brownian Motion	(I). Removal of impurities from the colloidal sols using a semipermeable membrane.
(B). Tyndall Effect	(II). Movement of colloidal particles under the influence of an electric field.
(C). Electrophoresis	(III). Random movement of colloidal particles due to kinetic energy.
(D). Dialysis	(IV). Scattering of light by colloidal particles

Choose the correct answer from the options given below:

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (II), (D) - (I)

Hint:

Dialysis uses a membrane and electrophoresis uses an electric field.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Each term in List I is a standard property or technique of colloids. We match it by its meaning.

Step 2: Brownian motion:
Colloidal particles keep moving in random zig-zag paths because the molecules of the dispersion medium hit them from all sides. So (A) matches (III).

Step 3: Tyndall effect:
A beam of light is scattered by colloidal particles and becomes visible. So (B) matches (IV).

Step 4: Electrophoresis:
Charged colloidal particles move towards one electrode under an electric field. So (C) matches (II).

Step 5: Dialysis:
Small ions and molecules pass through a semipermeable membrane and the colloid stays behind, which removes impurities. So (D) matches (I).

Step 6: Choose:
The matching is A-III, B-IV, C-II, D-I. This is option (D). The other options mix up at least two pairs, for instance (A) pairs Brownian motion with dialysis.

Final Answer:
The correct pairs are A-III, B-IV, C-II and D-I. \[ \boxed{\text{(D): A-III, B-IV, C-II, D-I}} \]